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Re:Dell patches 12-year-old driver vulnerability impacting m... by antibuddy on Tuesday May 04, 2021 @01:21PM (#27040011)
I'd infer from the CVE naming (CVE-2021-21551) that it was discovered this year.
Re:Dell patches 12-year-old driver vulnerability impacting m... by dspillett on Tuesday May 04, 2021 @07:48PM (#27044321)
It was publicly documented by the people generating those codes this year.

It could have been discovered quite some time before that, and going by some tweets already posted (caveat: I've not verified anything here) some parts of it at least we're noticed, and Dell notified about them, in 2019.